Hello, dear friend, you can consult us at any time if you have any questions, add WeChat: daixieit

STATA for Windows. ECN6540 Econometric Methods

COMPUTER PRACTICAL 4

Autocorrelation

1. Use the command ‘edit’ to open up the data editor in Stata. Then input the below data into Stata by hand:

YEAR

Y

X

1970

45.72

1015.5

1971

54.22

1102.7

1972

60.29

1212.8

1973

57.42

1359.3

1974

43.84

1472.8

1975

45.73

1598.4

1976

54.46

1782.8

1977

53.69

1990.5

1978

53.7

2249.7

1979

58.32

2508.2

1980

68.1

2732

1981

74.02

3052.6

1982

68.93

3166

1983

92.63

3405.7

1984

92.46

3772.2

1985

108.09

4019.2

1986

136

4240.3

1987

161.7

4526.7

Where Y=NYSE stock price index (1965=100), X=GNP ($ billions)

a.  Use the command ‘tsset YEAR’ to define the data inputted in Stata as time series data (with the time identifier called ‘YEAR’).

b.  Estimate the OLS regression of Y on X.

c.   Find out  if there is first-order autocorrelation in the data on the basis of the d- statistic.

d.  Gain an estimate of p from the d-statistic and transform the model obtaining GLS estimates.

e.  Gain an estimate of p from the residuals and transform the model obtaining GLS estimates.

f.   Now  re-estimate  the  original  model  in  part  (b)  including  a  lagged  dependent variable (note L.Y will include the lag of the dependent variable in the regression model, where ‘ L.’ is the lag operator).

g.  Test for autocorrelation (hint: you will need to calculate the durbin h-statistic)